Safety lock



Nov. 13, 1951 YACHZEL 2,575,309

SAFETY LOCK Filed April 22, 1948 -"1IIIIIIII I Air/Ia v Patented Nov. 13, 1951 I snFETY noon l lavid-tYaichzel, flhica'goglmn p licat on Anirn 22, 1 48;;S'Erial'No; 22,569 iv (01:10am) Claims"; t 1

My invention relates tosafety locks, andpertains to a double featurelbelt for a door or like closure wherein a latch=is= provided in' combination with key controlled meansfor locking the In one sense my invention may" be conand generally-satisfactory; for thefpurposes desired-i Various other advantages will suggest them: selves to those skilled in the art as the description proceeds- Referring now to the drawings formingapart of; ,t1iis;specification andjllust'rating a preferred 'dimejnt' of my invention .v

Egg-,1 is, an elevational' view,v o.f.- a lookembodyine -myf invention shown mountedgo'n a door. or, like olbsme, the latter being; shown, fragmentarily, the lockbeing shown in unlocked; conditiong 155,2 isja similar fragmentaryrdetailjedfelevation of thev operatingpar-ts of thelock shown in locked condition;

Fig. 3 is a.nerspectiver-viewon the complete lock;

Fig. 4 is, an elevationalfiview" showing thej rear offi theycylinder andpartss carriedithereby and 'Elgszj" and 6 are sectionalfi views taken; re-

The-numeral l-(Hndicatesa; door or other 'closure on which is mounted an improved lock l2 embodying my invention. In this'case the door closes a passage in a partition or wall, including a-door frame l3 on which is mounted a plate [4,

to receive or seat the locking elements.

While I have shown my invention as applied to a lock l2 of a basically standard type known as a burglar proof and jimmy proof double feature lock, it should be understood that I do not con sider my invention restricted to this type of lock but applicable to a wide variety of other locks for doors and other closures.

Inaccordance with the usual practice in looks ofthis general description, the lock l2 comprises a housing I6 for bolt elements (not shown) which are shot or actuated by means ofa: shaft or stem 18 and dog l9;'the latter; being manipulated by means of aknob 20- on theoutside of the casing l5. Inasmuch as the-boltmechaiiis'm andparts associated therewith controlled by'the knob 20' and stem- [8 are of standardor other suitable design, it is not considered necessary to showt-he same here, assuchpa-rtsfarewell known in thearta Suffice it to saythat" the b'olt, when actuated by the knob 20; steml8; 'dogfl I9; and parts controlled thereby, projects a locking' bar or the-like into interengagement' with U-shaped loops 2|, forming a; part ofthe housing ['6 and similar loops 23' formed'as' part of the" doorplate l4.

Secured to the housing if is a. key" actuated lock 25- which i's-preferablypf-a standard'c'ylinder type provided withkey-controlled' tumblers or the like. Said cylinder-lock 25 ma'y' be'secured to the casing I'Gby means of screws or the-like passing througl i ap'ertures din-the housing IB and-- engaging tapped holes zfl -i n tlie cylinder 25?. Thecylinder lock comprises a shaft 32 to which is secureda disk 351*said carrying an'out ward ly projecting tongue 3-l that serves as] an actuatingmember for'a'camabout tobedescribed- 6n the outside :of the casing I'Bf isisecured" a circular stem or" bearing 40" on-"wlii'chds jot-ire naled a cam 42, saidcam havinga curved face 45 of roughly spiral formation, and a substantially radial face 4'6- and also a;- radiallyprojectingfinger 48'," formin"g a stopseat- 49 oii'one side thereof and another stop- 1 face 50 on the other side" thereof. Also projecting from the housing It i's a limit Secured to theoutsideof' the" housing? l6 is-an elongated housing 53' for a slidable latch dr*dog 55 controlled by the cam- 42. The* dog 55*com'fpris'e's' in themain an:- elongated' stem portion 56 and a, head '.portioni ,58*;desi'gned to cooperate with lthe oam' 42i It'wil'r'be seentl'latthe head por tion 58 comprises an outwardly projecting portion 59 which serves in part to retain a helical n is believed that the operation of my device will be clear from the above description. The knob 20, operating through the stem I8 and dog I8, serves to actuate the bolt mechanism for the lock in the usual manner. Normally, due to the action of compression spring 6| operating on the projection 59 of the dog 55, said dog 55 will be urged away from engagement with the stem [8, as in the relation shown in Fig. 1, and in this condition the bolt mechanism is free to be locked or unlocked at will.

When it is desired to lock the bolt mechanism in either locked or unlocked relation to the doorplate, key is inserted in the cylinder lock 25 and the latter is rotated, as a result of which finger. 31 will act on the face 46 of the cam 42, as seen in Fig. 1, turning the cam in a' counterclockwise direction. The cam face 45 will thus act on the face 63 of the dog 55, urging it toward the left, as shown in the drawings, into the condition shown in Fig. 2 wherejsaid dog will interlock with the stem 18, securing it against rotation.

When it is desired to release the bolt mechanism, one turns the cylinder lock in the opposite or clockwise direction, whereupon the finger 31 will engage the face 41 of the cam 42 as seen in Fig. l, rotating it back to the position of Fig. l.

It will be seen that, as the cam is rotated clockwise, the dog 55 will be moved by the spring 6| toward the right, back to the position shown in Fig. 1 where it is out of locked engagement with the stem l8.

It will be obvious that devices embodying my invention may be constructed in various other ways without departing from the spirit of my invention. Thus, if desired, the cylinder lock may be applied to the opposite side of the look from the knob 20. Furthermore, my invention may be applied to other types of locks.

Furthermore, if desired, the bolt actuating stem I8 may be incorporated within the circumference of cylinder lock 25 or its housing in the manner shown in my copending application above referred to, instead of being separate therefrom as shown herein. In such case, it would merely be necessary to shorten the dog 58 and the spring 6|.

It should be understood therefore that the disclosure is merely exemplary of certain preferred forms and applications of my invention to which I do not intend to be limited.

I claim:

1. In a bolt look, a casing, a shaft within said casing and rotatable from one position to another position 180 degrees displaced therefrom to project a bolt to extended position and reversely to retract the bolt, said shaft having a diametrically positioned hole therein exteriorly of the casing, a cylinder lock within a housing mounted on said casing, a cam rotatable by said cylinder lock when a key is inserted therein, parallel guide means extending from within the housing of the cylinder lock to adjacent said rotatable shaft, one of said parallel guide means having an inturned abutment at its end adjacent said rotatable shaft, a dog slidably mounted between said parallel guide means and having a projection at one end forming a follower for said cam, a spring positioned between said abutment on the guide means and said projection on the dog biasing the latter to inoperative position, said cam being effective to shift the dog against the action of said spring into the hole in said shaft in either of the positions of the latter.

2. In a bolt lock, a casing, a shaft within said casing and rotatable from one position to another position degrees displaced therefrom to project a bolt to extended position and reversely to retract the bolt, said shaft having a diametrically positioned hole therein exteriorly of the casing, a cylinder lock within a housing mounted on said casing, a cam rotatable by said cylinder look when aj key is inserted therein, parallel guide means extending from within the housing of the cylinder lock to adjacent said rotatable shaft, one of said parallel guide means having an inturned abutment at its end adjacent said rotatable shaft, a cover plate extending from the housing of the cylinder look over said parallel guide mean to adjacent said rotatable shaft, a dog slidably mounted between said parallel guide means and having a projection at one end forming a follower for said cam, a spring positioned between said abutment on the guide means and said projection on the dog biasing the latter to inoperative position, said cam being effective to shift the dog against the action of said spring into th hole in said shaft in either of the positions of the latter.

DAVID YACHZEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Germany Dec. 29,1939 

